/*

 * pep.c                -- Common pep routines

 *

 * Copyrigth (C) 2009      Myhailo Danylenko <isbear@ukrpost.net>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or (at

 * your option) any later version.

 *

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307

 * USA

 */

#include <glib.h>

#include <gmodule.h>

#include <loudmouth/loudmouth.h>

#include <string.h>

#include <mcabber/xmpp.h>

#include <mcabber/hooks.h>

#include "pep.h"

typedef struct pep_handler_struct pep_handler_t;

struct pep_handler_struct {

	gchar               *xmlns;

	gpointer             data;

	pep_xmlns_handler_t  handler;

	GDestroyNotify       destroy_notify;

};

static GSList *pep_xmlns_handlers = NULL;

static LmMessageHandler *pep_message_handler = NULL;

static LmMessageHandler *pep_iq_handler      = NULL;

static pep_handler_t *pep_find_handler (const gchar *xmlns)

{

	GSList *hel;

	for (hel = pep_xmlns_handlers; hel; hel = hel->next) {

		pep_handler_t *handler = (pep_handler_t *) hel->data;

		if (!g_strcmp0 (handler->xmlns, xmlns))

			return handler;

	}

	return NULL;

}

static void pep_handler_free (pep_handler_t *handler)

{

	if (handler -> destroy_notify)

		handler -> destroy_notify (handler -> data);

	g_free (handler -> xmlns);

	g_free (handler);

	return;

}

static LmHandlerResult pep_handler (const gchar *from, LmMessageNode *mnode)

{

	LmMessageNode *node = lm_message_node_get_child (mnode, "items");

	if (node) {

		LmMessageNode *item;

		const gchar   *inode = lm_message_node_get_attribute (node, "node");

		for (item = node->children; item; item = item->next) {

			const gchar   *id = lm_message_node_get_attribute (item, "id");

			LmMessageNode *n;

			for (n = item->children; n; n = n->next) {

				const gchar *xmlns = lm_message_node_get_attribute (n, "xmlns");

				if (xmlns) {

					pep_handler_t *handler = pep_find_handler (xmlns);

					if (handler)

						handler->handler (from, inode, n, id, handler->data);

				}

			}

		}

	} // XXX else

	return LM_HANDLER_RESULT_REMOVE_MESSAGE;

}

static LmHandlerResult pep_iq_pubsub_handler (LmMessageHandler *handler, LmConnection *connectio, LmMessage *message, gpointer udata)

{

	LmMessageNode *node = lm_message_get_node (message);

	const gchar   *from = lm_message_node_get_attribute (node, "from");

	node = lm_message_node_get_child (node, "pubsub");

	if (node && !g_strcmp0 (lm_message_node_get_attribute (node, "xmlns"), NS_PUBSUB)) {

		return pep_handler (from, node);

	}

	return LM_HANDLER_RESULT_ALLOW_MORE_HANDLERS;

}

static LmHandlerResult pep_message_event_handler (LmMessageHandler *handler, LmConnection *connectio, LmMessage *message, gpointer udata)

{

	LmMessageNode *node = lm_message_get_node (message);

	const gchar   *from = lm_message_node_get_attribute (node, "from");

	node = lm_message_node_get_child (node, "event");

	if (node && !g_strcmp0 (lm_message_node_get_attribute (node, "xmlns"), NS_PUBSUB_EVENT)) {

		return pep_handler (from, node);

	}

	return LM_HANDLER_RESULT_ALLOW_MORE_HANDLERS;

}

void pep_register_xmlns_handler (const gchar *xmlns, pep_xmlns_handler_t handler, gpointer udata, GDestroyNotify notify)

{

	pep_handler_t *h = g_new (pep_handler_t, 1);

	h->xmlns          = g_strdup (xmlns);

	h->handler        = handler;

	h->data           = udata;

	h->destroy_notify = notify;

	pep_xmlns_handlers = g_slist_append (pep_xmlns_handlers, h);

	return;

}

void pep_unregister_xmlns_handler (const gchar *xmlns)

{

	pep_handler_t *handler = pep_find_handler (xmlns);

	if (handler) {

		pep_handler_free (handler);

		pep_xmlns_handlers = g_slist_remove (pep_xmlns_handlers, handler);

	}

}

static void pep_register_handlers (void)

{

	if (lconnection) { // XXX

		lm_connection_register_message_handler (lconnection, pep_message_handler, LM_MESSAGE_TYPE_MESSAGE, LM_HANDLER_PRIORITY_FIRST);

		lm_connection_register_message_handler (lconnection, pep_iq_handler, LM_MESSAGE_TYPE_IQ, LM_HANDLER_PRIORITY_FIRST);

	}

}

static void pep_unregister_handlers (void)

{

	if (lconnection) { // XXX

		lm_connection_unregister_message_handler (lconnection, pep_message_handler, LM_MESSAGE_TYPE_MESSAGE);

		lm_connection_unregister_message_handler (lconnection, pep_iq_handler, LM_MESSAGE_TYPE_IQ);

	}

}

// release handlers before reconnect

static void pep_hh (guint32 hid, hk_arg_t *args, gpointer userdata)

{

	hk_arg_t *arg;

	for (arg = args; arg->name; ++arg) {

		if (!strcmp (arg->name, "hook")) {

			if (!strcmp (arg->value, "hook-pre-disconnect"))

				pep_unregister_handlers ();

			else if (!strcmp (arg->value, "hook-post-connect"))

				pep_register_handlers ();

			return;

		}

	}

}

const gchar *g_module_check_init (GModule *module)

{

	// create handlers

	pep_message_handler = lm_message_handler_new (pep_message_event_handler, NULL, NULL);

	pep_iq_handler      = lm_message_handler_new (pep_iq_pubsub_handler,     NULL, NULL);

	// register hook handler

	hk_add_handler (pep_hh, HOOK_INTERNAL, NULL);

	// register handlers to connection

	pep_register_handlers ();

	return NULL;

}

void g_module_unload (GModule *module)

{

	// release handlers

	pep_unregister_handlers ();

	// remove hook

	hk_del_handler (pep_hh, NULL);

	{ // unregister xmlns handlers

		GSList *hel;

		for (hel = pep_xmlns_handlers; hel; hel = hel -> next) {

			pep_handler_t *handler = hel -> data;

			pep_handler_free (handler);

		}

		g_slist_free (pep_xmlns_handlers);

	}

	// destroy handlers (invalidate it just to be sure, though this should not happen :)

	lm_message_handler_invalidate (pep_message_handler);

	lm_message_handler_invalidate (pep_iq_handler);

	lm_message_handler_unref (pep_message_handler);

	lm_message_handler_unref (pep_iq_handler);

}

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